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[173.49.113.140]) by smtp.gmail.com with ESMTPSA id b4-20020a0cf044000000b0069b1e2f3074sm7258689qvl.98.2024.04.25.12.27.50 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Apr 2024 12:27:50 -0700 (PDT) From: Zack Rusin To: dri-devel@lists.freedesktop.org Cc: Broadcom internal kernel review list , ian.forbes@broadcom.com, martin.krastev@broadcom.com, maaz.mombasawala@broadcom.com, Zack Rusin , zdi-disclosures@trendmicro.com, David Airlie , Daniel Vetter , linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH] drm/vmwgfx: Fix invalid reads in fence signaled events Date: Thu, 25 Apr 2024 15:27:48 -0400 Message-Id: <20240425192748.1761522-1-zack.rusin@broadcom.com> X-Mailer: git-send-email 2.40.1 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Correctly set the length of the drm_event to the size of the structure that's actually used. The length of the drm_event was set to the parent structure instead of to the drm_vmw_event_fence which is supposed to be read. drm_read uses the length parameter to copy the event to the user space thus resuling in oob reads. Signed-off-by: Zack Rusin Fixes: 8b7de6aa8468 ("vmwgfx: Rework fence event action") Reported-by: zdi-disclosures@trendmicro.com # ZDI-CAN-23566 Cc: David Airlie CC: Daniel Vetter Cc: Zack Rusin Cc: Broadcom internal kernel review list Cc: dri-devel@lists.freedesktop.org Cc: linux-kernel@vger.kernel.org Cc: # v3.4+ Reviewed-by: Maaz Mombasawala Reviewed-by: Martin Krastev --- drivers/gpu/drm/vmwgfx/vmwgfx_fence.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c b/drivers/gpu/drm/vmwgfx= /vmwgfx_fence.c index 2a0cda324703..5efc6a766f64 100644 --- a/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_fence.c @@ -991,7 +991,7 @@ static int vmw_event_fence_action_create(struct drm_fil= e *file_priv, } =20 event->event.base.type =3D DRM_VMW_EVENT_FENCE_SIGNALED; - event->event.base.length =3D sizeof(*event); + event->event.base.length =3D sizeof(event->event); event->event.user_data =3D user_data; =20 ret =3D drm_event_reserve_init(dev, file_priv, &event->base, &event->even= t.base); --=20 2.40.1